This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 6 |
| 1 | 7 |
| 2 | -65 |
| 3 | -295 |
| 4 | -1303 |
| 5 | 20631 |
| 6 | 89967 |
| 7 | 392616 |
| 8 | -6178549 |
| 9 | -26970688 |
| 10 | -117731275 |
| 11 | 1852943703 |
| 12 | 8088348131 |
| 13 | 35306734632 |
| 14 | -555682818080 |
| 15 | -2425630962790 |
| 16 | -10588208505263 |
| 17 | 166644858132571 |
| 18 | -727427431532172 |
| 19 | 3175319503526856 |
| 20 | -49975467287014789 |